Air-pressure regulator



May 1, 192s.

E. o. scHJQLlN AIR PRESSURE REGULATOR Filed June 5o. 1926 4 Sheets-Sheet 1 May 1, 192s. 1,668,57

E. O. SCHJOLIN AIR PRES SURE REGULATOR Filed June 5o. 1926 4 sheets-sheet 2 l l l I l l l unllfw i E. O. SCHJOLIN AIVR PRESSURE REGULATOR Filed June 30. 1926 4 Sheefcs-Sheet 3 May 1', 192s.

May l, 1928. 1,668,517

5.0. scHJoLlN.

AIR PRESSURE REGULATOR Filed' June 5o. 1926 4 sheets-shewb 4 pressure regulator.

Patented May 1, 1928.

UNITED STATES um om scIIJoLIN, or'cnIcAeo, ILLINOIS, AssIeNon ro eENnnAI. morons oonl fronAr'Ior, or' Dumm, iIIcIIIefAIlI, A conronArIoN or DELAWARE.

AIAB-PRESSURE REGULATOR.

Application #led June 30, 1928. Serial No. 119,620.

This invention relates to an air brake sys- ,tem intended for use on vehicles similarto that shown and described in my' a lllation :for air brake system for vehicles, er. No. 751,755, iiled November 24, 1924.

ticularly to an improved air pressure regulator for such a system. f

One object of the invention is to locate the air pressure regulator between the air pumipl and the tan A rther object is to so construct the regulator that`v there is incorporated within it an air cleaner.

`1A `further object is to provide for oo nvenient inspection and repair without disconnecting the line connections.

Other objects and advantages will be apparent. A

In the drawing accompanying the speci-` lication: f o

Figure' 1 is a plan view of the chassis showing my invention installed.

Figure 2 is a vertical sectional view through the air pump used with the brake system. I

Figure 3 is a section on line 3-3 of Figure 4 showing the internal details of the Figure 4 is a side elevation of the same.

Figures 5 and 6 represent diagrammatically two different positions of the parts within the pressure regulator.

Figure 7 is a plan view on line 7-7 of Figure 4. v Figure 8 is a side view of the bracket shown in Figure 7.

Referring by reference characters ,tothe drawin numeral 1 shows in dotted lines a vehic e chassis including the usual frame,

' wheels, motor` and driven parts. The air brake system comprises a pump 3 mounted on the front end of the lengine to be driven thereby. The pump is connected by a pipe 5to the pressure regulator which is more particularly the, subject of this application. From the pressure regulator the pipe 7 extends to the tank 9. From the jtank the airis passed through the pipell -to -a controlling valvel12, more full described in my prior application referre to. A ipe line 13 car-u ries the air under pressure om the controlling valve to a ba anced check valve 15 located on one side of the chassis frame. From the check valve pipe lines extend along the frame to points adjacent the front axle and the middle of the rear axles. At last point another check valve 15 is used from which pipes extendl to the brakes at the wheels. The present application relates more par- In this application no claim is made for the specific details of the pump. However,

an important feature of the invention is the means for ensuring clean air for the system. In Figure 2 is shown at 17 an air cleaner connected by a pipe 19 to the carburetor,

wirr-:NT oFFlcr.. i

notshowm- From the pipe 19 extends, at app roximately a right angle, a pipe 21 leadin to the pump inta e valve. This pipe is fille t with horse hair. The air passing cleaner 17 may contain some water and some dust particles. The angular relation of pi es 19 and 21 is such that through the action of avity and inertia the water and dust is, or the most part, kept out of pipe 21. The pump has the usual piston 21 and connecting rod 23, the latter driven in any convenient way from the' crank shaft. The air compressed by the pump passes the exhaust valve 25 to the pipe line and the pressure regulator. The pressure regulatorv comprises a bracket 31 and a valve member 33. The bracket has an arm 35 by which it is to be secured to the chassis frame, openings 37 being provided for the passage of securing members. The bracket has an opening 39 for connection with the pipe to the tank. A second openin 41 for the pi e from the pump and an out et 43 throng` which the air from the pump is exhausted when the tank is full charged, as will be explained. Above the racket the valve chamber is secured byV ,fastening means 45, a gasket 44 between the bracket and the valveni'ember vpreventing leakage.

By the arrangement described, it `will be noticed that the inlet and discharge connections are made solel with the bracket, and that the valve mem er may be removed toinspect, clean or to repair internal parts without disturbing the air line connections. It may be added that this feature is incorporated in the other attachments including the brake application valve and the check valves.

The valve member is seen to have two passages. Passage 47 has threaded into one end a plug 49 to which is engaged by threads a cylinder 51 which is to be lled with horse shair for the purpose of removing any foreign matter from the air. The plug 49 has several lateral openings 53 through which the compressed air from the pump enters and passes within the air cleaning cylinder 51. The purpose of this second cleaning of the air is -to remove any particles which mayhave entered .the pump from the first air cleaning process and also to remove any foreign matter such as particles of carbon, which may have been introduced into the air by the pump itself. It is very important that there should be no foreign matter to interfere with the action of the controlling valve mechanism for operating the brakes. The air cleaned within cylinder 51 passes without the same into passa e 47. Into the other end of passage 47 is t readed a plug 53 within which is seated a sprin 55 holding the ball valve 57 against a re uced portion of the passage which forms a valve seat. Beneath the ball valve a passage 59 communicates with outlet 39 to t-he tank. A second passageway 61 is spaced from the rst passageway. Near one end of passage 61 is an inner transverse wall 63 forming a seat for ball valve 65. A spring 67 engages said ball valve and holds it against its seat by engaging as an abutment a plug 69 threaded into opening 61. In the other end of passage 61 is thi'caded'anapertured plug 71. A p unger 73 is movably mounted within passage 61. It carries an extension 74 which may engage and lift ball valve for a purpose to be explained. The plunger has a sealing cup 7 5held by nuts 77 and 79. The stem 81 of the plunger is guided in an opening of suitable size in plug 71. The end of the stem is threaded and secured thereto is an adjustable abutment 82 for a spring 84. A lock nut 86 is also threaded on stem 81. The spring 84 engages at its other end the part of the plug having the guiding opening. A cap 83 is threaded on the end of plug 71 and gaskets 88 and 90 are used to prevent eakage.

A curved passage 91 is formed iiiv the top f of the bracket and affords communication between the passage 59 beneath the ball valve 57 and an opening 92 into the passage 61 on the sealing cup side of the plunger. A second curved passage 92, also, in the top of the bracket communicates by opening 93 with passage '47 and by opening 94 with passage 61 at a point beneath ball valve 65. From passage 61 an opening 95 aiords communication with opening 43. At the outlet of opening 43 is a cup 97 which may be filled with horse hair or other like material to prevent the noise of the escaping air.

Air from the pump enters the regulator at 41. It passes through .the cylinder filled with horse hair and then by way of the ball valve 57 outth-rough opening 39 to the tank. It will be seen that the tank pressure is communicated b conduit 91 to the 61 beneath t e plun r. vWhen t e pressure in the tank rises s ciently the lunger 73 is moved against the resistance o s ring 84 and ball valve 65 is lifted from its seat. There is thus permitted a free flow of air through the passage 92 past the ball valve 65 and out through the exhaust opening. In the meantime, obviously, the valve 57 is closedr to prevent the escape of airy from the tank through passage 92. After the tank pressure is reduced to about eighty.V ounds by repeated applications of the bra e, the spring. 84 acts to withdraw the plunger and the ball valve 65 closes. The pump then again charges the tank by rway of ballvalve 57 up to a predetermined maximum pressure.

For fthe purpose of determining the presassageway sure at which 'the change in course "of air.

takes place the threaded envagement of abutment has been rovided. figures 5 and 6 are included in t e drawing to show diagrammatically the two positions of the parts of the regulator. Ff re 5 shows the clean air being passed on o the tank, the arrows indicate the directin of the' air flow. Figure 6 shows the air being exhausted as 1s the case when the tank is fully char ed. It will be understood that when in use, t 'e tank pressure falls the spring will again permit ball valve 65 to close, afterwhich the pum will restore the air tank pressure automatically.

1. A pressure regulator for `a\ pump and tank system for d cleaner and a valve arrangement, whereby the air is cleaned and delivered at times to the tank and at other times to an exhaust opening.

2. In combination with an air cleaner and a pipe therefrom to deliver cleaned air, a branch pipe at an angle to said pipe, and an air pump for supplying a. tank, the branch pipe communicating with the inlet of said pump. 4

3. In'combination with an air cleaner for supplying clean air to the carburetono'f a Jgas engine, a pipe leading ktherefromv for connection to said carburetor, a branch pipe extending at an angle to said first pipe, means in said second pipe to .arrest the pas sage ofl foreign matter,'an air ump, the second pipe being connected to t e inlet of the air pump) 4. In com ina-tion, an air pump, a tank. an air cleaner at the inlet f said'pump, and a second air cleaner between said pump and tank. t'

5. A pressure regulator comprising a member having a chamber, a valve controlled conduit from said chamber to a tank, a second valve controlled conduit from said chamber to an' exhaust, means associated with said second mentioned valve and conlll() uids combining an air if said first valve to control the passage of gas through said regulator.

6. A pressure regulator comprising a member having a chamber, means 1n said chamber to remove foreign matter from air entering said chamber, a valve controlled conduit :from said chamber to a tank, a. second valve controlled conduit from said chamber to an exhaust opening, mea-ns associated with said second mentioned valve and controlled by the pressure on the tank side ot' the first valve to control the passage of gas through the regulator. i

7. A regulatorfor air pressure lines including a pump and a tank, a. regulator having a chamber, a passage from said chamber to the tank, 'a second passage from said pump` to an exhaust opening, a valve for each passage, mechanical means for opening the valve in said second passage under the l action of air from the tank side of the first valve, spring means to normally withdraw the mechanical means which opens the second valve. i

8. Ina fluid pressure regulator, a. member having t-Wo chambers, the first chamber having an inlet` to receive air from the pump and the valved outlet for discharge to the tank, the second chamber having a valve discharge to `an exhaust opening l and a plunger having an extension to open said second valve, a spring to normally withdraw said plunger from operative position, the Aregulator having an air passage from beneath the first valve to a portion of said second chamber on the side of the plunger remote from the valve, there being a second air passagefrom the first chamber communicating with the second chamber by means of said second valve.

9. In a fluid pressure system, a pump, a tank,'a pipe line including a regulator between the pump and tank, a chamber in the regulator to receive air from the pump, a valve controlling flow of air from the chamber to the tank, a variable volume chamber in constant'communication with said tank, a valve controlled passage from saidv first chamber to an exhaust opening, means whereby the variation in volume of said variable volume chamber controls the valve in said valve controlled passage.

10. A pump, a. regulator, a tank, a conduit affording communication between said parts, a chamber in` said regulator to receive fluid from said pump, a check valve between said chamber and the outlet from the regulator to the tank, a passage from said chamber to an exhaust opening, a check valve normally enclosing said passage, a second chamber in constant communication with said tank, one wall of said/ second chamber being movable, a part movable with said movable wall to at times open said second valve, yielding means effective to move the movable wall in a direction to permit the closing of said valve.

11. A pressure regulator, a chamber therein having an inlet and a valved outlet, a valved conduit from said chamber to a second outlet, a fluid tight variable volume chamber within said regulator, means whereby the varia-tion in said variable volume chamber controls directly one of said valves and the action of the regulator.

In testimony whereof I aHix my signature.

ERIC OLIE SCHJOLIN. 

